Journal
ACS CATALYSIS
Volume 6, Issue 10, Pages 6335-6342Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b01503
Keywords
metal-organic framework; bifunctional electrocatalyst; non-noble metal; electronic structure; rechargeable Zn-air battery
Categories
Funding
- National Basic Research Program of China (973 Program) [2012CB215500]
- National Natural Science Foundation of China [21373199, 21433003]
- Strategic priority research program of CAS [XDA09030104]
- Jilin Province Science and Technology Development Program [20140203012SF, 20150101066JC, 20160622037JC]
- Recruitment Program of Foreign Experts [WQ20122200077]
- Jilin Province Key Laboratory of Low Carbon Chemical Power
Ask authors/readers for more resources
Rational design of electrocatalysts to replace the noble-metal-based materials for oxygen reactions is highly desirable but challenging for rechargeable metal-air batteries. Herein, we demonstrate a unique two stage encapsulation strategy to regulate the structure and performance of catalysts featured with thin graphene nanosheets coupling with full encapsulated ultrafine and high-loaded (similar to 25 wt %) transition metal nanoparticles (TMs@N(C)x) for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). By optimizing the electronic modulation effect from suitable metal cores, the best NiFe@NCx catalyst exhibits high stability and activity with an onset potential of 1.03 V for ORR and an overpotential of only 0.23 Vat 10 mA cm(-2) for OER, which is superior to commercial Pt/C and IrO2 catalysts. Rechargeable Zn-air battery using NiFe@NCx catalyst exhibited an unprecedented small charge-discharge overpotential of 0.78 V at 50 mA cm(-2), high reversibility, and stability, holding great promise for the practical implementation of rechargeable metal-air batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available